Simple Machines | Science Trek | PBS LearningMedia
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Simple Machines | Science Trek | PBS LearningMedia
A simple machine has few or no moving parts, but because of them, humans have been able to create the wonders of the world: the pyramids, computers, even your jar of peanut butter. Learn more about the six types of simple machines—lever, pulley, wheel and axle, inclined plane, wedge, and screw—and how they make work easier.
2013年9月18日
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